Journal ArticleDOI
Nitrogen-isotope ratio studies of soils and groundwater nitrate from alluvial fan aquifers in Texas☆
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TLDR
Kreitler et al. as discussed by the authors identified two ranges of nitrogen-isotope values for soil nitrate under different land uses in west Texas: nitrate originating from nonfertilized, cultivated fields (δ 15N range, +2 to +8‰ with an average of +4.9About:
This article is published in Journal of Hydrology.The article was published on 1979-06-01. It has received 215 citations till now. The article focuses on the topics: Nitrate & Fertilizer.read more
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Book ChapterDOI
Tracing nitrogen sources and cycling in catchments
TL;DR: In this article, the authors focus on the uses of isotopes to understand water chemistry and discuss the use of isotopic techniques to assess impacts of changes in land management practices and land use on water quality.
Book ChapterDOI
Tracing Anthropogenic Inputs of Nitrogen to Ecosystems
TL;DR: For example, the World Health Organization and U.S. Environmental Protection Agency have set a limit of 10 mg L nitrate (as N) for drinking water because nitrate poses a health risk, especially for children, who can contract methemoglobinemia (blue-baby syndrome) as mentioned in this paper.
Journal ArticleDOI
Isotopic studies of nitrogen pollution in the hydrosphere and atmosphere: A review
TL;DR: A review of the use of 15N/14N ratios in investigating sources and mechanisms of pollution in the hydrosphere is given in this paper, where it is shown that these differences are largely the result of kinetic isotope fractionation associated with bacterially-mediated reactions.
Journal ArticleDOI
Atmospheric nitrogen is a reliable standard for natural 15 N abundance measurements
TL;DR: In this paper, a simple method for the preparation of atmospheric N2 as a standard for δ15N expression with excellent reproducibility is presented, which indicates a wide homogeneity in isotopic composition of atmospheric nitrogen which appears to be a reliable standard for 15N natural abundance measurements.
Journal ArticleDOI
Groundwater recharge and agricultural contamination
TL;DR: For reactive con- taminants like NO 3 -, a combination of chemical, isoto- pic, and environmental-tracer analytical approaches might be required to resolve changing inputs from subse- quent alterations as causes of concentration gradients in groundwater Groundwater records derived from multi- component hydrostratigraphic data can be used to quan- tify recharge rates and residence times of water and dis- solved contaminants, document past variations in recharging contaminant loads, and identify natural contam- inant-remediation processes.
References
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Journal ArticleDOI
Determination and Isotope-Ratio Analysis of Different Forms of Nitrogen in Soils: 3. Exchangeable Ammonium, Nitrate, and Nitrite by Extraction-Distillation Methods1
J. M. Bremner,D. R. Keeney +1 more
TL;DR: In this article, a method for determining exchangeable ammonium, nitrate, and nitrite in soils is described, which involves extraction of the soil sample with 2M KCl (10 ml/g of soil) and analysis of the extract by steam-distillation methods in which magnesium oxide is used for distillation of ammonium.
Journal ArticleDOI